I usually have had excellent success with a SWC style 125 gr bullet from Mountain Moulds using 5 grains of Silhouette powder;. recently I have been testing a 135 grain projectile of a very similar design, same lead mixture, and powder, first impressions were were favourable as the round appeared to be just as accurate as my first choice, but yesterday I found several rounds keyholing. Since the only major difference is the 10 grains in weight I am somewhat puzzled.. The bullet is sized exactly the same as the 125 grain bullet looks good as the 125 grain projectile, cast weight is consistent, the firearms used are the same.. Anyone have any suggestions, I would appreciate it. Both bullets were sized .356 I have loaded a few test rounds sizing them at .358 That I hope to test in a few days, hoping that will change things. As previously mentioned the 125 grain round performs well as can be seen the attached image of 10 rounds fired at 25 meters. I was hoping the new 135 grain would be close!
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